Standard gas temperature and humidity control device
By combining the humidity controller and the temperature controller, the precise temperature and humidity control of the standard gas of the gas detector is achieved, which solves the problem of inaccurate measurement of the gas detector under complex working conditions, and improves the measurement accuracy and calibration efficiency.
Patent Information
- Application Number
- CN202421883772.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-08-02
AI Technical Summary
After the laboratory calibration, existing gas detectors cannot effectively adapt to complex and changeable working conditions, especially when temperature and humidity change greatly, problems such as inaccurate measurement and monitoring failure are prone to occur.
The combination of humidity controller and temperature controller is used to achieve a control balance between temperature, humidity and flow, ensuring the accurate humidity, temperature and flow ratio of standard gases.
By accurately controlling the temperature and humidity values of standard gases, we ensure the accuracy of the measurement data of the gas detector under different working conditions, reduce the result deviation, and improve the inspection and calibration work efficiency and quality.
Smart Images
Figure CN222952625U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas detection, in particular to a standard gas temperature and humidity control device. Background Art
[0002] In the field of gas detection, gas detectors, as key safety monitoring equipment, are widely used in many fields such as industry, environmental protection, and safe production. When traditional gas detectors are calibrated and tested in a laboratory environment, they are usually in relatively stable temperature and humidity conditions, such as temperature controlled between 15°C and 30°C and extremely low humidity (no more than 0.5% RH). Under such environmental conditions, gas detectors can demonstrate good measurement performance and accuracy. However, when these devices are applied to actual working conditions, they need to face complex and changeable environmental conditions, including extreme temperature changes (-30°C to 50°C) and large humidity fluctuations (2% to 95% RH). Such huge differences in environmental conditions often result in the inability of laboratory-calibrated gas detectors to maintain their original measurement accuracy under actual working conditions.
[0003] In particular, for some gases that are easily soluble in water, such as hydrogen sulfide, sulfur dioxide, hydrogen chloride, ammonia, etc., their solubility is significantly affected by the ambient humidity. Therefore, under conditions where the humidity changes greatly, the concentration measurement of these gases becomes particularly difficult, which can easily lead to monitoring failure or inaccurate measurement of the gas detector.
[0004] In addition, semiconductor gas sensors, as sensitive components commonly used in gas detectors, are particularly sensitive to environmental humidity. Semiconductor gas sensors that perform normally under laboratory conditions may give false alarms or fail to give alarms in high humidity environments, which greatly reduces the safety and reliability of gas detection alarms.
[0005] To sum up, although the existing gas detectors are calibrated using standard gases in the laboratory, the temperature and humidity changes in the laboratory are small, resulting in small changes in the temperature and humidity values of the standard gas. In actual applications, the calibrated gas detectors cannot effectively adapt to complex and changeable environmental conditions, especially under working conditions with large changes in temperature and humidity. There are often problems such as inaccurate measurements and monitoring failures. Utility Model Content
[0006] The purpose of the utility model is to provide a standard gas temperature and humidity control device, which adopts a combination of a humidity controller and a temperature controller to balance the temperature, humidity and flow control, ensure the accurate ratio of humidity, temperature and flow of the standard gas, thereby solving the problems raised in the above-mentioned background technology.
[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0008] A standard gas temperature and humidity control device includes a humidity controller, the humidity controller has an input end for receiving standard gas and an output end for outputting standard gas, the input end is connected to a first three-way diverter valve, the other two ends of the first three-way diverter valve are respectively connected to a first pipeline and a second pipeline, the first pipeline is sequentially provided with a precision dew point meter and a dry gas mass flow meter, the precision dew point meter is used to measure the actual dew point value of the standard gas and produce saturated standard gas, the second pipeline is sequentially provided with a saturated humidity generator and a wet gas mass flow meter, the precision dew point meter is wirelessly connected to the saturated humidity generator, the saturated humidity generator calculates the required amount of water to be supplemented according to the dew point value measured by the precision dew point meter, the other ends of the first pipeline and the second pipeline are merged into one through a three-way converging valve, the other end of the three-way converging valve is connected to the output end, and is used to output the standard gas processed by the humidity controller.
[0009] Further preferably, the output end is connected to a temperature controller for receiving the standard gas outputted from the output end, and the temperature controller is provided with a temperature control module for adjusting the temperature of the received standard gas.
[0010] Further preferably, the temperature controller is connected to a second three-way diverter valve, and the other two ends of the second three-way diverter valve are respectively provided with a gas detection port and a gas exhaust port.
[0011] Further preferably, a gas flow controller is provided between the second three-way diverter valve and the gas detection port and the gas exhaust port, for controlling the flow rate of gas outputted from the temperature controller to the gas detection port and the gas exhaust port.
[0012] Further preferably, a feedback regulation module is integrated inside the saturated humidity generator, and the feedback regulation module calculates the amount of water that needs to be added to the gas at a certain flow rate based on the dew point value measured in real time by a precision dew point meter, and automatically adjusts the internal working state of the saturated humidity generator.
[0013] Compared with the prior art, the beneficial effects of the utility model are: adopting a temperature, humidity and flow control balance method to ensure the accurate ratio of humidity, temperature and flow of the standard gas to achieve the preset temperature and humidity values, so that standard gases with different temperatures and humidities can be used when calibrating gas detectors in the laboratory, ensuring the accuracy of data when the gas detector is measured under different working conditions, reducing the possibility of result deviation, and improving the efficiency and quality of calibration work. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the structure of the standard gas temperature and humidity control device of the utility model;
[0015] In the figure: 1. humidity controller; 101. input end; 102. output end; 11. first three-way diverter valve; 12. first pipeline; 121. precision dew point meter; 122. dry gas mass flow meter; 13. second pipeline; 131. saturated humidity generator; 132. wet gas mass flow meter; 14. three-way converging valve; 2. temperature controller; 3. second three-way diverter valve; 4. gas flow controller; 5. gas detection port; 6. gas exhaust port. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0017] See also Figure 1 , the utility model provides a technical solution:
[0018] A standard gas temperature and humidity control device includes a humidity controller 1, which has an input end 101 for receiving standard gas and an output end 102 for outputting standard gas, the input end 101 is connected with a first three-way diverter valve 11, the other two ends of the first three-way diverter valve 11 are respectively connected with a first pipeline 12 and a second pipeline 13, the first pipeline 12 is sequentially provided with a precision dew point meter 121 and a dry gas mass flow meter 122, the outlet end of the precision dew point meter 121 is connected with the inlet end of the dry gas mass flow meter 122, the second pipeline 13 is sequentially provided with a saturated humidity generator 131 and a wet gas mass flow meter 132, the saturated humidity generator The outlet end of 131 is connected to the inlet end of the wet gas mass flowmeter 132, the precision dew point meter 121 is wirelessly connected to the saturated humidity generator 131, the other ends of the first pipeline 12 and the second pipeline 13 are merged into one path through the three-way converging valve 14, the outlet end of the three-way converging valve 14 is connected to the output end 102, the output end 102 is connected to the inlet end of the temperature controller 2, the outlet end of the temperature controller 2 is connected to a second three-way diverter valve 3, the outlet end of the second three-way diverter valve 3 is divided into two paths, one of which is connected to the gas flow controller 4 and the gas detection port 5 in sequence, and the other is connected to the gas flow controller 4 and the gas exhaust port 6 in sequence.
[0019] When in use, the standard gas enters the humidity controller 1 from the input end 101, passes through the first three-way diverter valve 11, and a part of it flows through the first pipeline 12 and enters the precision dew point meter 121, and the dew point value is detected and displayed in real time, and then enters the dry gas mass flow meter 122 to monitor its flow parameters; the other part flows through the second pipeline 13 and enters the saturated humidity generator 131. The saturated humidity generator 131 is internally integrated with a feedback adjustment module. The feedback adjustment module calculates the amount of water that needs to be added to the standard gas according to the dew point value measured by the precision dew point meter 121, and automatically adjusts the working state of the saturated humidity generator 131, and then enters The wet gas mass flow meter 132 monitors the flow parameters of the gas after the humidity is adjusted. The dry gas mass flow meter 122 and the wet gas mass flow meter 132 adjust the flow rates of their respective outputs according to the preset humidity value, so that the output standard gases are combined to form standard gases that meet the preset humidity value, and then enter the temperature controller 2. The standard gas is adjusted to the preset temperature through the internal temperature control module. Finally, the standard gas that meets the preset humidity value and temperature value enters the gas flow controller 4 through the second three-way diverter valve 3. The flow rate of the standard gas entering the gas detection port 5 is adjusted according to the actual calibration requirements, and the excess standard gas enters the gas exhaust port 6 for discharge.
[0020] The working principle of the utility model is as follows: a part of the standard gas is measured by the precision dew point meter 121 to measure the gas dew point value, and to prepare for the production of saturated standard gas, the flow value is measured by using the relationship between the pressure difference and flow formed when the gas flows through the dry gas mass flow meter 122, and the dry gas is output; the other part of the standard gas enters the saturated humidity generator 131, and the feedback adjustment module set inside is used to calculate the amount of water to be added to the gas according to the dew point value measured in real time by the precision dew point meter 121, and the flow is measured by using the static pressure difference generated when the fluid passes through the metering tube of the wet gas mass flow meter 132, and the wet gas is output; finally, the output dry gas and wet gas are mixed to form a dew point temperature standard gas, so as to meet the requirement that the output gas is the set relative humidity. At this time, the standard gas that meets the humidity requirement enters the temperature controller 2, and the temperature detection element set inside the temperature controller 2 converts the temperature signal into an electrical signal to detect the temperature value. The temperature signal is compared with the preset temperature value through the comparison element. When the temperature is inconsistent, the standard gas will be quickly adjusted to the preset temperature through the temperature control module and kept constant. Finally, the standard gas that meets the temperature and humidity requirements passes through the gas flow controller 4, and the gas flow entering the gas detection port 5 and the gas exhaust port 6 is adjusted according to the calibration requirements.
[0021] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.
[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A standard gas temperature and humidity control device, comprising a humidity controller (1), characterized in that: The humidity controller (1) comprises an input end (101) for receiving standard gas and an output end (102) for outputting standard gas. The input end (101) is connected to a first three-way diverter valve (11). The other two ends of the first three-way diverter valve (11) are respectively connected to a first pipeline (12) and a second pipeline (13). The first pipeline (12) is provided with a precision dew point meter (121) and a dry gas mass flow meter (122) in sequence. The second pipeline (13) is provided with a saturated humidity generator (131) and a wet gas mass flow meter (132) in sequence. The precision dew point meter (121) is wirelessly connected to the saturated humidity generator (131) for exchanging signals. The other ends of the first pipeline (12) and the second pipeline (13) are merged into one path through a three-way converging valve (14). The other end of the three-way converging valve (14) is connected to the output end (102) for outputting standard gas.
2. The standard gas temperature and humidity control device according to claim 1, characterized in that: The output end (102) is connected to a temperature controller (2) for receiving the standard gas outputted from the output end (102); a temperature control module is provided inside the temperature controller (2), and the temperature control module is used to adjust the temperature of the received standard gas.
3. The standard gas temperature and humidity control device according to claim 2, characterized in that: The temperature controller (2) is connected to a second three-way diverter valve (3), and the other two ends of the second three-way diverter valve (3) are respectively connected to a gas detection port (5) and a gas exhaust port (6).
4. The standard gas temperature and humidity control device according to claim 3, characterized in that: A gas flow controller (4) is provided between the second three-way diverter valve (3) and the gas detection port (5) and the gas exhaust port (6), and is used to control the flow rate of gas output by the temperature controller (2) to the gas detection port (5) and the gas exhaust port (6), respectively.
5. The standard gas temperature and humidity control device according to claim 1, characterized in that: The saturated humidity generator (131) has an integrated feedback adjustment module therein, and the feedback adjustment module is used to calculate the amount of water that needs to be added to the standard gas according to the dew point value measured in real time by the precision dew point meter (121), and automatically adjust the internal working state of the saturated humidity generator (131).